<template>
  <div class="upload-box">
    <el-upload
        v-model:file-list="fileList"
        :accept="fileType.join(',')"
        :action="uploadUrl"
        :before-upload="beforeUpload"
        :class="['upload', drag ? 'no-border' : '']"
        :disabled="disabled"
        :drag="drag"
        :http-request="httpRequest"
        :limit="limit"
        :multiple="true"
        :on-error="uploadError"
        :on-exceed="handleExceed"
        :on-success="uploadSuccess"
        list-type="picture-card"
    >
      <div class="upload-empty">
        <slot name="empty">
          <Icon icon="ep:plus" />
          <!-- <span>请上传图片</span> -->
        </slot>
      </div>
      <template #file="{ file }">
        <img :src="file.url" class="upload-image" />
        <div class="upload-handle" @click.stop>
          <div class="handle-icon" @click="imagePreview(file.url)">
            <Icon icon="ep:zoom-in" />
            <span>查看</span>
          </div>
          <div v-if="!disabled" class="handle-icon" @click="handleRemove(file)">
            <Icon icon="ep:delete" />
            <span>删除</span>
          </div>
        </div>
      </template>
    </el-upload>
    <div class="el-upload__tip">
      <slot name="tip"></slot>
    </div>
  </div>
</template>

<script setup>
import { ref, watch } from 'vue'
import { ElNotification } from 'element-plus'
import { createImageViewer } from '@/components/ImageViewer'
import { propTypes } from '@/utils/propTypes'
import { useUpload } from '@/components/UploadFile/src/useUpload'
import { useMessage } from '@/hooks/web/useMessage'

defineOptions({ name: 'UploadImgs' })

const message = useMessage() // 消息弹窗

// 查看图片
const imagePreview = (imgUrl) => {
  createImageViewer({
    zIndex: 9999999,
    urlList: [imgUrl]
  })
}

const props = defineProps({
  modelValue: propTypes.oneOfType([String, Array]).isRequired,
  drag: propTypes.bool.def(true),
  disabled: propTypes.bool.def(false),
  limit: propTypes.number.def(5),
  fileSize: propTypes.number.def(5),
  fileType: propTypes.array.def(['image/jpeg', 'image/png', 'image/gif']),
  height: propTypes.string.def('150px'),
  width: propTypes.string.def('150px'),
  borderradius: propTypes.string.def('8px')
})

const { uploadUrl, httpRequest } = useUpload()

const fileList = ref([])
const uploadNumber = ref(0)
const uploadList = ref([])

const beforeUpload = (rawFile) => {
  const imgSize = rawFile.size / 1024 / 1024 < props.fileSize
  const imgType = props.fileType
  if (!imgType.includes(rawFile.type))
    ElNotification({
      title: '温馨提示',
      message: '上传图片不符合所需的格式！',
      type: 'warning'
    })
  if (!imgSize)
    ElNotification({
      title: '温馨提示',
      message: `上传图片大小不能超过 ${props.fileSize}M！`,
      type: 'warning'
    })
  uploadNumber.value++
  return imgType.includes(rawFile.type) && imgSize
}

const emit = defineEmits(['update:modelValue'])

const uploadSuccess = (res) => {
  message.success('上传成功')
  // 删除自身
  const index = fileList.value.findIndex((item) => item.response?.data === res.data)
  fileList.value.splice(index, 1)
  uploadList.value.push({ name: res.data, url: res.data })
  if (uploadList.value.length == uploadNumber.value) {
    fileList.value.push(...uploadList.value)
    uploadList.value = []
    uploadNumber.value = 0
    emitUpdateModelValue()
  }
}

// 监听模型绑定值变动
watch(
    () => props.modelValue,
    (val) => {
      if (!val) {
        fileList.value = [] // fix：处理掉缓存，表单重置后上传组件的内容并没有重置
        return
      }

      fileList.value = [] // 保障数据为空
      fileList.value.push(
          ...val.map((url) => ({ name: url.substring(url.lastIndexOf('/') + 1), url }))
      )
    },
    { immediate: true, deep: true }
)

// 发送图片链接列表更新
const emitUpdateModelValue = () => {
  let result = fileList.value.map((file) => file.url)
  emit('update:modelValue', result)
}

// 删除图片
const handleRemove = (uploadFile) => {
  fileList.value = fileList.value.filter(
      (item) => item.url !== uploadFile.url || item.name !== uploadFile.name
  )
  emit(
      'update:modelValue',
      fileList.value.map((file) => file.url)
  )
}

// 图片上传错误提示
const uploadError = () => {
  ElNotification({
    title: '温馨提示',
    message: '图片上传失败，请您重新上传！',
    type: 'error'
  })
}

// 文件数超出提示
const handleExceed = () => {
  ElNotification({
    title: '温馨提示',
    message: `当前最多只能上传 ${props.limit} 张图片，请移除后上传！`,
    type: 'warning'
  })
}
</script>

<style lang="scss" scoped>
.is-error {
  .upload {
    :deep(.el-upload--picture-card),
    :deep(.el-upload-dragger) {
      border: 1px dashed var(--el-color-danger) !important;

      &:hover {
        border-color: var(--el-color-primary) !important;
      }
    }
  }
}

:deep(.disabled) {
  .el-upload--picture-card,
  .el-upload-dragger {
    cursor: not-allowed;
    background: var(--el-disabled-bg-color) !important;
    border: 1px dashed var(--el-border-color-darker);

    &:hover {
      border-color: var(--el-border-color-darker) !important;
    }
  }
}

.upload-box {
  .no-border {
    :deep(.el-upload--picture-card) {
      border: none !important;
    }
  }

  :deep(.upload) {
    .el-upload-dragger {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 100%;
      padding: 0;
      overflow: hidden;
      border: 1px dashed var(--el-border-color-darker);
      border-radius: v-bind(borderradius);

      &:hover {
        border: 1px dashed var(--el-color-primary);
      }
    }

    .el-upload-dragger.is-dragover {
      background-color: var(--el-color-primary-light-9);
      border: 2px dashed var(--el-color-primary) !important;
    }

    .el-upload-list__item,
    .el-upload--picture-card {
      width: v-bind(width);
      height: v-bind(height);
      background-color: transparent;
      border-radius: v-bind(borderradius);
    }

    .upload-image {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .upload-handle {
      position: absolute;
      top: 0;
      right: 0;
      display: flex;
      width: 100%;
      height: 100%;
      cursor: pointer;
      background: rgb(0 0 0 / 60%);
      opacity: 0;
      box-sizing: border-box;
      transition: var(--el-transition-duration-fast);
      align-items: center;
      justify-content: center;

      .handle-icon {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 0 6%;
        color: aliceblue;

        .el-icon {
          margin-bottom: 15%;
          font-size: 140%;
        }

        span {
          font-size: 100%;
        }
      }
    }

    .el-upload-list__item {
      &:hover {
        .upload-handle {
          opacity: 1;
        }
      }
    }

    .upload-empty {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      line-height: 30px;
      color: var(--el-color-info);

      .el-icon {
        font-size: 28px;
        color: var(--el-text-color-secondary);
      }
    }
  }

  .el-upload__tip {
    line-height: 15px;
    text-align: center;
  }
}
</style>

